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參數(shù)資料
| 型號： | LX1672-06CLQ-TR |
| 廠商： | MICROSEMI CORP-ANALOG MIXED SIGNAL GROUP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 1 A DUAL SWITCHING CONTROLLER, 690 kHz SWITCHING FREQ-MAX, PQCC38 |
| 封裝： | ROHS COMPLIANT, PLASTIC, MLPQ-38 |
| 文件頁數(shù)： | 9/20頁 |
| 文件大?。?/td> | 382K |
| 代理商： | LX1672-06CLQ-TR |
PRODUCTION DATA SHEET
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 17
Copyright
2000
Rev. 1.0, 2005-08-10
WWW
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LX1672
Multiple Output LoadSHARE PWM
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APPLICATION NOTE ( C ONTINU ED)
OUTPUT DISABLE
The LX1672 PWM MOSFET driver outputs are shut off by
pulling the disable (DISX) pins above 1.2V.
The LDO voltage regulator has its own Disable pin (LDDIS)
for control of this output voltage. Pulling this pin above 3V
disables the LDO.
PROGRAMMING THE OUTPUT VOLTAGE
The output Voltage is sensed by the feedback pin (FBX) which
is compared to a 0.8V reference. The output voltage can be set to
any voltage above 0.8V (and lower than the input voltage) by
means of a resistor divider R1 - R2 (see Figure 1).
)
/R
R
(1
V
2
1
REF
OUT
+
=
Note: Keep R1 and R2 close to 1kΩ (order of magnitude)
DDR VTT TERMINATION VOLTAGE
Double Data Rate (DDR) SDRAM requires a termination
voltage (VTT) in addition to the line driver supply voltage
(VDDQ) and receiver supply voltage (VDD). Although it is not a
requirement VDD is generally equal to VDDQ; so that only VTT
and VDDQ are required..
The LX1672 can supply both voltages by using two of the three
PWM phases. Since the currents for VTT and (VDD plus VDDQ)
are quite often several amps, (2A to 6A is common) a switching
regulator is a logical choice
VTT for DDR memory can be generated with the LX1672 by
using the positive input of the phase 2 error amplifier RF2 as a
reference input from an external reference voltage VREF which is
defined as one half of VDDQ. Using VREF as the reference input
will insure that all voltages are correct and track each other as
specified in the JEDEC (EIA/JESD8-9A) specification. The phase
2 output will then be equal to VREF and track the VDDQ supply as
required.
When an external reference is used the Soft Start will not be
functional for that phase.
See Microsemi Application Note 17 for more details.
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相關(guān)PDF資料 |
PDF描述 |
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| LX1672-03CPW-TR | 1 A DUAL SWITCHING CONTROLLER, 345 kHz SWITCHING FREQ-MAX, PDSO28 |
| LX1672-03CLQ-TR | 1 A DUAL SWITCHING CONTROLLER, 345 kHz SWITCHING FREQ-MAX, PQCC38 |
| LX1673-06CLQT | 1 A SWITCHING CONTROLLER, 690 kHz SWITCHING FREQ-MAX, PQCC20 |
| LX1673-03CLQT | 1 A SWITCHING CONTROLLER, 345 kHz SWITCHING FREQ-MAX, PQCC20 |
| LX1673-09CLQT | 1 A SWITCHING CONTROLLER, 1035 kHz SWITCHING FREQ-MAX, PQCC20 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LX1673 | 制造商:MICROSEMI 制造商全稱:Microsemi Corporation 功能描述:High Frequency PWM Regulator |
| LX1673-03CLQ | 功能描述:IC REG DL BCK/LINEAR SYNC 20MLPQ RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 線性 + 切換式 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- 拓?fù)?降壓（降壓）同步（2），線性（LDO）（1） 功能:任何功能 輸出數(shù):3 頻率 - 開關(guān):300kHz 電壓/電流 - 輸出 1:控制器 電壓/電流 - 輸出 2:控制器 電壓/電流 - 輸出 3:控制器 帶 LED 驅(qū)動器:無 帶監(jiān)控器:無 帶序列發(fā)生器:是 電源電壓:4.5 V ~ 24 V 工作溫度:-40°C ~ 85°C 安裝類型:* 封裝/外殼:28-TSSOP（0.173"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:* 包裝:帶卷 (TR) 其它名稱:ISL6402IVZ-TTR |
| LX1673-03CLQ-TR | 制造商:Microsemi Corporation 功能描述:VOLT MODE PWM CNTRLR 0.8V TO 5.5V 1A 20MLPQ - Tape and Reel |
| LX1673-03CPW | 功能描述:IC REG DL BCK/LINEAR 20TSSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 線性 + 切換式 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- 拓?fù)?降壓（降壓）同步（2），線性（LDO）（1） 功能:任何功能 輸出數(shù):3 頻率 - 開關(guān):300kHz 電壓/電流 - 輸出 1:控制器 電壓/電流 - 輸出 2:控制器 電壓/電流 - 輸出 3:控制器 帶 LED 驅(qū)動器:無 帶監(jiān)控器:無 帶序列發(fā)生器:是 電源電壓:4.5 V ~ 24 V 工作溫度:-40°C ~ 85°C 安裝類型:* 封裝/外殼:28-TSSOP（0.173"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:* 包裝:帶卷 (TR) 其它名稱:ISL6402IVZ-TTR |
| LX1673-03CPW-TR | 制造商:Microsemi Corporation 功能描述:VOLT MODE PWM CNTRLR 0.8V TO 5.5V 1A 20TSSOP - Tape and Reel |
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